Normally when you purchase a computer most of them come with the trail version of office 2007 / 2010 which would be valid for 60 day but as you are saying it was working for 14 months then your computer has come with a full version of office 2007 i would suggest you to check with the disc which came along when you purchased the computer they might have come with a product key of office 2007 & if you are able to find the media /CD then you can call microsoft and they would be generating a new product key based on the part number which is on the back of the CD.
If you do not have the CD / Media then you have to purchase the software or you can download a cracked version of office 2007 from the below link and use the product key
Microsoft Office Professional
2007 :- MTP6Q-D868F-448FG-B6MG7-3DBKT
http://msft-dnl.digitalrivercontent.net/01/21178109-3203819-O12PROTR-NOA/msoffice/pub/X12-30196/X12-30196.exe
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